Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles

Burks, Terrance; Àvila, Marta; Akhtar, Farid; Göthelid, Mats; Lansåker, Pia; Toprak, Muhammet S.; Muhammed, Mamoun; Uheida, Abdusalam

doi:10.1016/j.jcis.2014.03.025

Cited by 93 publications

(51 citation statements)

References 52 publications

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“…Therefore, a monolayer of HCrO 4 -probably forms on the solid surface. A q max value of 87 mg g -1 was found, which is higher than that reported for adsorbents composed of other solids such as modified activated carbons [11] and modified iron oxide magnetic nanoparticles [8,43]. Cao et al assessed an amino-functionalized MCM-41 for the adsorption of Cr(VI) at pH \ 4, and the maximum adsorption capacity reported was 38.55 mg g -1 [22].…”

Section: Chromium Adsorptionmentioning

confidence: 87%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorptiondesorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after four use/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1 mg g -1 at 25°C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given.

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Section: Chromium Adsorptionmentioning

confidence: 87%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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“…The synthesis procedure of SPION (~ 10 nm) and 3-MPA-coated SPION has been described elsewhere [23]. A stock solution of iron(III) in chloride medium was prepared by dissolving the salt with a 3-MPA solution (150 mM) in toluene using a rotary shaker for 24 hours.…”

Section: Synthesis Of Adsorbent Materialsmentioning

confidence: 99%

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Morillo

Uheida

Pérez

et al. 2015

Journal of Colloid and Interface Science

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In the present work, superparamagnetic iron oxide nanoparticles (SPION) surface-coated with 3-mercaptopropanoic acid (3-MPA) were prepared and their feasibility for the removal of arsenate from dilute aqueous solutions was demonstrated. The synthesized 3-MPA-coated SPION was characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infra-red spectrometry (FTIR). Separation efficiency of the coated nanoparticles and the equilibrium isotherm of arsenate adsorption were investigated. The obtained results reveal the arsenate adsorption to be highly pH-dependent, and the maximum adsorption was attained in less than 60 minutes. The resulting increase of 3-MPA-coated SPION adsorption capacity to twice the adsorption capacity of SPION alone under the same conditions is attributed to the increase of active adsorption sites. An adsorption reaction is proposed. On the other hand, efficient recovery of arsenate from the loaded nanoparticles was achieved using nitric acid (HNO 3 ) solution, which also provides a concentration over the original arsenate solution. HIGHLIGHTS• Feasibility of using SPION modified with 3MPA for the removal of As(V).• The adsorbent system results in an effective sorption for selective As(V) removal.• The adsorption capacity for As(V) is higher comparing with other adsorbent systems.• Adsorption mechanism has been proposed as the most suitable considering the results.

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“…In principle, Cr(VI) uptake by iron oxide nanoparticles is favoured at acidic pH (Burks et al 2014), as the predominant form in solution is the hydrogen chromate ion (HCrO 4 -) (Benefield 1982), while the magnetite surface becomes more positively charged and thereby facilitates the attraction of these negatively charged species. Zeta potential experiments at different pH values were carried out to corroborate the surface charge of the magnetite nanoparticles.…”

Section: Effect Of Ph On the Cr(vi) Recoverymentioning

confidence: 99%

“…Figure 3a shows that the adsorption of Cr(VI) decreases as the pH increases, and this reduction in the removal capability is more notable at pH 4.5. Although the efficiency is higher at low pH, the magnetic nanoparticles can be partially dissolved at a very acidic pH, (Burks et al 2014) even with the surfactant cover that can protect them from dissolution. As the recyclable and reusable capacity of the magnetic nanoparticles is also investigated in this work, it is important to avoid, as much as possible, the dissolution of the particles.…”

Section: Effect Of Ph On the Cr(vi) Recoverymentioning

confidence: 99%

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Martínez

Muñoz‐Bonilla

Mazarío

et al. 2015

Int. J. Environ. Sci. Technol.

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Well-dispersed magnetite nanoparticles of different sizes between 15 and 43 nm were synthesized by an electrochemical method in a controlled manner by simply changing the synthesis temperature. These nanoparticles were used as a reusable adsorbent to remove Cr(VI) from aqueous solution. The recovery efficiency was found to be highly dependent on environmental parameters, such as temperature and pH. In addition, it was demonstrated that the initial concentrations of both Cr(VI) and magnetite nanoparticles strongly influence the removal capability of these nanomaterials. Remarkably, the nanoparticle size has a key role on the Cr(VI) adsorption efficiency, which gradually increases as the diameter decreases due to the augmentation of the surface area. The low aggregation in the case of small particles that results from the low magnetization saturation values also contributes to the enhancement of the surface area available for Cr(VI) adsorption. In contrast, nanoparticles with larger sizes are more easily manipulated by a magnet, and the efficiency is largely maintained after five cycles. The adsorption process fits the Langmuir isotherm model well, and the reaction was found to follow a pseudo-second-order rate.

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Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles

Cited by 93 publications

References 52 publications

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

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